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Hi Simon,
First of all you should, if possible, run separate waste pipes from the bath and basin. They do work much better and will solve your problem at a stroke. As the waste water from the bath runs past the basin connection it is sucking in water, and eventually air from the basin which will slow down the rate of flow. Connecting the basin waste pipe may also be introducing a backfall in the waste pipe from the bath, if not done correctly, which could also be part of the problem. Run them separately and all your worries will be over.
Best wishes